Telephony.



No. 824,032. PATENTBD JUNE19,1906.

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TELEPHONE AYPLIGATIOII mass: 1 2.10, 1905.

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' UNITED STATES PATENT OFFICE.

Specification of Letters Patent.

Patented June 19, 1906.

Application filed April 10, 1905. Serial No. 254,770.

To all whom it may concern:

Be it known that I IsIDoR KITSEE, of the city and county of Philadel his and State of Pennsylvania, have invented certain new and useful Improvements in Telephony, of which the following is a specification.

My invention relates to an im rovement in telephony, and has more specie reference to a system of long-distance telephon wherein two metallic circuits are connects together with the interposition of an inductive circuit.

In the drawing, which illustrates in diegrammatic view my invention, A is an outlying or subscribers station located in one city, and A is an outlying or subscribers station located in a second city more or less remote from the first.

B is a center or exchange in the first city, and B a. center or exchange in the second city.

C is the line of transmission, running between the two cities and connecting these two exchanges with each other.

In both exchanges similar characters indicate similar parts, with the exception that in the second or right-hand station the designation of thevarious parts has the numeral 1 added thereto in other words, the right-hand exchange is a duplication of the left-hand exchange.

D is the switchboard, usually employed in such exchanges, and as this switchboard and the connection of its jacks may be substantially the same as now practiced in the leading systems I only illustrate in conventional signs part of said switchboard without showing in detail the construction and connections of the same.

G is the connecting-cord in its entirety, consisting of the two circuits 7c and Z, inductively related to each other through the repeating device 0.

Eis a long-distance switchboard provided is with the jack H. This jack consists of the two movable parts 9 and h and also the stationary contacts 11, j, m, and n. These stationary contacts 'i and are connected with What is technically called the annunciat' key -that is, a ty e of switch wherehy wit the aid of the mova hle part annunciating devices are brought in and out of contact with.

the jack-circuits. In the drawing this switch arrangement is designated as an entirety by the letter F. The stationary contacts'i and j are normally connected to the pair of springcontacts a of the switch F. This pair of contact-springs c are connected with the pair of s ring-contacts b, including in their circuit the annunciating device, here shown as the lamp (1.

0 represents a pair of spring-contacts normally out of contact with the pair aand mclude in their circuit the battery f and the annunciating device e, also shown as slain V The line of transmission C consists o two airs of wires, one pair comprising the menated conductors 1 and 2 and the other pair comprising the insulated conductors 3 and 4. i and 2 are twisted together so as to produce a great inductive eiiect on each other, and 3 and 4 are also inductively twisted together. At the cxchan e B the near terminal of 1 is connected to t e movable part g of the jack H and the near terminal of 4 is connected to the other movable part 71. of said jack. The near terminals of 2 and 3 are connected to the stationary contacts we and n, respectlvely. At the exchan e B the near terminal of 2 is connected to t e movable part g and the near terminal of 3 to the movable part it of the jack H while the near terminals of 1 and 4 are connected to the stationary contacts m and a, respectively.

As ion as the jacks arein their normal conditiont at is, as long as the stationary contacts connect with the movable parts of the jacks the pair of wires 1 and 2 are metallically connected to each other in the exchange B through m and g, and at the exchange B through m and p and the pair of wires 3 and 4 are metallical y connected with each other in the exchange B through a and h and in the exchange B through a and h. The pair of wires 1 and 2 are electrically connected to the Wire pair 3 and 4 in the exchangeB through the sprin pair c. connecting with the air of s rings ii, circuitm as to each other t ough t e lamp d. At t e exchange B the pair of wires 1 and 2 are in electrical connection with the air of wires 3 and si through the pair of springs a connecting with the pair of sprin s t, circuiting as to each other through the amp d.

It is supposed that the subscriber of station A has called up the exchange B for the pur ose of communicating with the subscri or at station A. The operator at the exchange B manipulates the annunciatingkey F in a manner so that the spring-contacts a disconnect from the spring-contacts b and connect with the pair of spring-contacts c. The lamp (2 is therefore cut out and the battery f with the lamp e is placed in the circuit. The flow of the battery starting from the positive pole will therefore be throu h lamp 6, lighting the same, through one of t e contacts of the pair 0, through one of the contacts of the pair a. i g m and 1 and 2, will flow through this circuit to the exchange B, thence through m and 9, one contact of the pair a, one contact of the pair I), lamp d, ighting the same, and will return through the other contact of the pair I), the second contact of the pair a, h and n, and will then flow through wires 3 and 4 back to the exchange Band as these wires are connected, through points it and movable part h, one of the springs a, one of the springs c, with the other pole of the battery, it is obvious that the circuit is established and that the two lamps e at station B and d at station B will remain lighted till the operator at B has answered the call. To answer this call, it is only necessary for the operator at B to insert the plu connected to the cord G in the jack H. T ough this insertion the metallic connection between the wires 1 and 2, as well as the metallic connection between the wires 3 and 4, will be broken at the exchange B. At the same time the wires 2 and 3 Wlll be brought out of contact with the annunciati switch F. Through this manipulation t e annunciatin lamp 6, which formerly was lit at B wil now be extinguished, and. the operator at B will thereby be notified that the operator is ready for communication. The operator at B will then replace his annunciating-key F in its normal position and will connect, throu hthe cord G, the subscriber A with the 'ack Through this connection the meta ic contact between 1 and 2, as well as the metallic contact between 3 and 4, will be broken and the keycircuit will be brought out of contact with the jack. We will therefore have a metallic line from A connecting electrically with the part 7:: of the connecting cord G, inductively connected with the art 1. This part 1 is electrically connecte throughthe jack parts 9 and h, with the wires 1 and 4, respectively. These wires run along the whole line between the exchanges and end at the exchange B; but at this exehan e they are nowiree and unconnected, an as the operator at this exchange has now inserted one part of the cord G into the jack H and the other part of this cord into. the jack of the switchboard D the wires 2 and 3 are in electrical connection with the part 1 of the cord and throu in same inductively related to the part 0 said cord, which cord is electrically connected to the station A We therefore have a circuit connecting metallically its subscriber with one exchan e and connecting inductively the two exc anges with each other.

I have only shown one station centering with its circuit in the exchange; but it is obvious that in reality a series of such subscribers stations center therein, as otherwise the exchange would be unnecessary.

I have placed one lamp directly in the circuit; but it is obvious that the usual arrangement of operating the lamps through an electromagnet inserted in the line may be substituted.

I have not shown one operators phone but I have indicated the place where the same may be inserted by the lines 2.

Having now described my invention,what I claim as new, and desire to secure byLetters Patent, is

1. In combination with two outlying stations connected each through an all-metallic circuit with an exchan e, the exchanges more or less remote from eac other, a line of transmission connecting inductively said exchanges with each other, said line of transmission consisting of two pairs of wires, the two wires of each of said pairs twisted in intimate relation with each other, and means at each exchan e to connect the outlying station with sai line of transmission.

2. In combination, two exchanges, each exchange provided with the terminals of a series of outlyin stations centering therein each with an al -metallic line, two switchboards for each of said exchanges, one of said switchboards connected to said all-metallic lines, a line of transmission comprising two pairs of wires the wires of each air in inductive relation as to each other, t e terminals of both pairs connected at one end in one exchange to the second of said switchboards and with the other end at the second exchange with the second switchboard therein, means at each exchange to produce an all-metallic line of said two pairs, said means embracing an annunciating device, means at each exchange to break connection with said first means and make connection with a second means includin a source of current, and means at each exc ange to connect the line of transmission to an outlying circuit, said means adapted to change the connection of the transmitting-line at both exchanges so as to convert the former metallic lines into a line inductively connecting one exchange with a second exchange.

3. In combination with two exchanges wherein all-metallic lines center, a line of transmission inductively connecting both exchanges with each other, means at each exchan e to convert said line into a straight meta lic line including annunciatin devices and means to connect said line wit one or the other of the metallic lines of the outlying IIC stations, said means reconverting the line of to one ef said circuits, and the remaining :0 transmission into a line inductively eomleet- Wire of each pair to the second 0% said ciring bath exchanges with each other. suite,

4. In cembination three lines of transmis- In testimon whereof I hereby sign my sion, two of said lines comprising em ell-mename this 7th ey of A ti 1985. tallie circuit, the third of said lines compris- FSIDOR KYTSEE. ing two airs of conductors, the wires of each Wimesses: penin actively related to each other, and EDITH R. STILLEY, means to connect one wire ef each pair H. O. YETTEB. 

